PC Memory maps (was: Re: 486 w/newer IDE drives)

[Robert Feldman]

Using a Tecmar Graphics Master in a DTK XT clone, I could get, IIRC, 704 KB 
of RAM.

Bob


>From: "Chuck Guzis" <cclist at sydex.com>
>Reply-To: "General Discussion: On-Topic and Off-Topic 
>Posts"<cctalk at classiccmp.org>
>To: "General Discussion: On-Topic and Off-Topic Posts" 
><cctalk at classiccmp.org>
>Subject: Re: PC Memory maps (was: Re: 486 w/newer IDE drives)
>Date: Fri, 24 Nov 2006 11:30:11 -0800
>
>On 24 Nov 2006 at 14:07, Sean Conner wrote:
>
> >   The major problem with that is MS-DOS---it can't handle non-contiguous 
>RAM
> > and therefore there is no standard way to reserve or use memory in the 
>upper
> > 384K of the address space (well, for those PClones that followed the IBM
> > spec).
>
>I seem to recall a few PCs with built-in CGA display adapters gave
>one more contiguous memory than 640K by filling the space between
>A000 and C000 with RAM.  And many "not very compatible" PCs running
>MS-DOS made the entire 1MB available.
>
>Anyone with an old Visual Commuter want to verify this?  I think that
>the Commuter was one of the aforementioned.
>
>Cheers,
>Chuck
>

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